Know what no review can promise you
Before you choose a stake, know that the bonus round can come on any spin. How often it comes is not known in advance, and the result of one session is random whatever the RTP. The RTP of 96.50 describes an average over a very large number of spins, so it cannot tell you how your next session will end.
Deciding which version to play starts with the game rules. The RTP version running here is shown only there, so open the rules before your first stake. Use the rules screen to confirm the figure, not the game title or the lobby thumbnail.
Treat the top prize as a ceiling, not a target. The maximum win of Bigger Bass Splash is x5,000 the bet, and it is reached very rarely. Set your budget before the first spin, and stop when it runs out.